Grate-bar.



F. FRECHETTE.

GRATE BAR.

APP'L-lcATloN FILED 001.2. 191s.

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Patented May 1, 1917.

2 SHEETS-SHEET l.

F. FRCHETTE.

GR`ATE BAR. APPLICATION FILED OCT. 2, |916- 1,224,159. 11116111611 May1, 1911.

2 SHEETS-SHEET 2' /Jz M622 for 19.1/

FERDINAND FRCHETTE, 0F NOTRE DAME DE CHARNY, QUEBEC, CANADA.

GRATE-BAR.

Specification of Letters Patent.

Patented May 1, 19f7.

Application led October 2, 1916. Serial No. 123,266.

To aZZ whom/t may concern.'

Be it known that l, FERDINAND FR- ci-IETTE, a subject of the King of Great Britain, residing at Notre Dame de Charny, Province of Quebec, Canada, have invented certain new and useful improvements in Grate-Bars; and l do hereby declare that the following is a full, clear, and eXact'description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to grates and more particularly to that class of grate bars which are provided with water spaces through which water may circulate to keep them cool and prevent warping and burning.

An object of thej present invention is to provide hollow grate bars for furnaces and connect the same with a suitable source of water supply whereby the water will be caused to circulate through .the grate bars thereby cooling the grate bars and subsequently the water from the grate bars which has become heated may be discharged into the boiler, thus heatingthe water previous to its discharge in the boiler and also protecting the grate bars by preventing them from becoming burned out.

A further object of the present invention is to pro-vide a system of the character specied for grate bars whereby should one or more of the bars of the grate become broken or in any other manner spring a leak so as to cause the water to discharge therefrom the water supplied to the broken grate bar or bars may be disconnected so that a new grate bar or bars may be readily substituted therefor and the remaining grate bars may be continuously used.

With the above and other objects in view which will hereinafter appear as the description continues, the invention consists of the novel features of construction and the formation of parts as will be hereinafter more fully described and particularly pointed out in the appended claims.

In the accompanying drawings is shown the simple and preferred form of the invention it being, however, understood that no limitation is necessarily made to the precise structural details herein exhibited but the right is hereby reserved to any changes or alterations that may be had and come within the scope of the invention without departing from the spirit thereof or sacrificing the efIiciency of the same.

In the accompanying drawings;

Figure l is a diagrammatical representation of a furnace boiler showing the grate bars forming the subject matter of the present invention as in operative communication therewith by means of the system of water supply between the boiler and the grate bars;

Fig. 2 is a vertical section through one end of the grate bars'in. which the controlling valves are arranged;

Fig. 3 is an end elevation of the opposite ends ofthe grate bars;

Fig. A is a horizontal section taken on the line -fl of Fig. 2;

ig. 5 is a plan view of the grate bars;

Fig. 6 is a vertical section through the same showing one of the bars of one section in elevation and one of the bars of the other section in vertical section.

Referring now more particularly to the drawings wherein like and corresponding parts are designated by similar reference characters throughout the several views.

The grate as herein shown comprises two sections indicated by the letters A and B and each section comprising a plurality of grate bars 1 cast or bored to form a longitudinal conduit 2 through which water may pass freely, and in order to catch and direct the inrushing air beneath the grate so that it will evenly be distributed instead of rushing to the back and rising at one point, the bars are provided with the vane sections 3 which curve downwardly and forwardly toward the front end of the grate to deflect the air as it rushes into the ash pit beneath the grate. These vane sections are so disposed as to aline themselves to form substantially parallel vanes extending across the sides of the grate and running transversely of the grate bars. The adjacent ends of the grate bars are adapted to be mounted upon a support 4 and the alining grate bars of each section are in communication by means of the couplings 5. The inner ends of the grate bars of section B are arranged upon the support 6 and these ends of the grate bars are connected by the U shaped couplings 7. The forward end of the grate bars arranged in section A are supported upon a casting 8 and this casting has a channelway 9 arranged therein. Leading from the channelway 9 are a plurality of openings each of which corresponds with an opening in the forward end of the grate bars, and arranged within these openings are the couplings 10 which form a means of communication between the various grate bars and the channelway 9, and these couplings are also each provided with right and left hand screw threads to form means of connection between the grate bars and the casting 8.

The boiler of the furnace indicated by the numeral 11 is provided with a steam dome 12 and leading from the boiler are a pair of inlet pipes 13 and 14- each of which having a controlling valve 15 arranged therein and the ends of these pipes 13 are in communication with the opposite ends of the channelway 9 formed within the casting 3. Connected to the casting 8 and in communication with the channelway 9 at the point 16 is a supply pipe 17. Communicating with the supply pipe 17 is a vertically eX- tending pipe 18 and the latter being in communication with a horizontally arranged pipe 19 which leads from the boiler l1. Also leading from the pipe 19 is a vertical pipe 20 which terminates in a coil 21 arranged within the tank 22. Leading from 'the bottom of the tank 22 is a pipe 23 which is also in communication with the supply pipe 17. The main water supply pipe 211 has arranged therein an injector 25, a controlling valve 26 and its upper end is in communication with the pipe 2O as at 27 which leads to the tank v22. Leading from the steam dome is a'steam supplying pipe 28 and this pipe has arranged therein controlling valves 29 and is in communication with the injector 25.

A Froml the foregoing it is obvious that when the valves 29 are opened the steam from the steam dome 12 will pass through the pipe 28 into the injector 25 where it will force t-he water from the main supply pipe 24 into the tank 22. The hot water from the boiler 11 will pass from the pipe 19 through the pipe 20 through the coils 54C into the tank 22 and this hot water will heat the tank to the required degree. As the cold water which is coming from the main water supply pipe is discharged within the tank 22 the hot water coming from the boiler will heat the new supply of water within the tank 22 thereby supplying to the grate bars heated water of a temperature that will assist in cooling l'the grate bars without injuring the same.

Supported by means of a bracket 52 to the tank 22 is a casing 51 having a oat valve 53 arranged therein. Leading to the casing 51 of the tank 22 is a supply pipe 50. As any or all of the steam that is liable to accumulate within the tank 22 will pass into the tank 51 and permitted subsequently to be blown off pass by the float valve 53. The water contained within the tank 22 will obviously be governed by the height of the water contained within the boiler 11.

Should one of the grate bars become worn or broken and a new one be desired to be substituted therefor I have provided a valve for controlling the entrance of water to each grate bar whereby the supply of water to each grate bar may be controlled and at the same time the circulation through the re- -maining grate bars will not be in any way affected. Arranged within the casting S are a plurality of valves 31 having valve stems 32, and these valves 31 are adapted to seat themselves in the valve seats 33 leading to t-he points of communication between the channelway 9 and the interior of the-grate bars 1. From this it is obvious that should it be desired to discontinue `the circulation of water through any one of the grate bars the valve controlling the admission to said grate bars may be caused to seat itself within the valve seats 33 thereby closing the means of communication between the grate bars and the channelway 9. rlhe valves 311 arranged at each side of the inlet openings 16 when in their lower-most position as shown will open the means of communication to the channelway 9 and the respective grate bars but should either one of these valves be closed half way one face thereof will close the channelway so as to prevent the liow of water therethrough at either side of these valves and when they seat themselves within the valve seats -33 they will close the means of communication between the channelway 9 and the grate bars arranged above said valves. rThe valves 35 which are less in length than the valves 34 are adapted to close the channelway 9 at the point v36 when raised so that when one face of the valves 35 will extend over the portions 36 of the channelway thereby permitting the circulation of water through the grate bars arranged above the valves 35 but theremaining grate bars will be disconnected from the water supply. These valves 35 will also seat themselves'in the valve seats -33 for disconnecting the source of supply to the grate bars arranged above the valves 35 and when so arranged they will not interfere with the ypassage of water through the channelway 9 to the remaining grate bars. Likewise'the remaining valves may be used for `disconnectingy the supply of water to the grate bar arranged above said valve and also will break the means of communication between the main supply pipe of water and the remaining grate bars arranged at the opposite sides of .grate bars in section A, through the-connection 5, then into the grate bars arranged within the section B, and subsequently be returned through the adjacent grate bars by passing through U shaped unions 7 and the water is subsequently carried off through the pipes 13 and 14 to the boiler.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:

l. In a grate of the character described lo comprising two sections, grate bars arranged in each section, means of communication between one end of said grate bars, a casting having a channelway therein, an inlet pipe leading to the medial portion of said casting, outlet pipes leading from the opposite ends of said casting, means of communication between said channelway and said grate bars, valves for controlling the means of communication between said channelway and said grate bars and said valves also adapted to close said channelway for the purpose set forth.

2. In a grate of the character described comprising two sections, a plurality of grate bars arranged within each section, means of communication between the alining grate bars in each section, U shaped connecting unions between the rear ends of the grate bars in one section, a casting, means for 3f supporting the forward end of the grate bars in one section upon said casting, a channelway arranged within said casting,

means of communication between said channelway and the forward ends of the grate bars within one section, valve seats arranged within said casting in the path of communication between said channelway and said grate bars, and vertically movable valves adapted to seat themselves in said valve seats and also adapted to close said channelway for the purpose set forth.

3. In a device of the character described the combination with a plurality of hollow interconnected grate bars, a casting for supporting one end of said grate bars, the said casting having a channelway formed therein and extending throughout its length, detachable means of communication between each of said grate bars and said channelway formed within said casting, inlet and outlet openings communicating with said channelway, valve seats arranged within said casting, a valve adapted to rest within each of said valve seats, each of said valves adapted to close said valve seats for closing the means of communication between said channelway and said grate bars, and each of said valves adapted to closev portions of said channelway substantially as and for the purpose specified.

In witness whereof I have hereunto set my hand.

FERDINAND FRGHETTE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C." 

